Add a few more scripts

convert-all-songs

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+set -euo pipefail
+
+for file in *.mp3; do
+  echo "* Converting $file to ${file%.mp3}.m4a..."
+  rm -f "${file%.mp3}.m4a"
+  "${BASH_SOURCE[0]}/../convert-song" "$file" >/dev/null 2>&1
+done

convert-song

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+set -euo pipefail
+
+input="$1"
+if ! [ -r "$input" ]; then
+  if ! [ -z "$input" ]; then
+    echo "[error] File not found: $input"
+  else
+    echo "usage: $0 <input mp3>"
+    echo
+    echo "Converts an mp3 to an m4a (AAC) and reduces the bitrate to 128 kbps."
+  fi
+  exit 1
+fi
+
+# -vn drops video on the floor, required for source mp3s with artwork
+ffmpeg -i "$input" -vn -c:a aac -b:a 128k "${input%.mp3}.m4a"

crunch-android-devices.rb

@@ -0,0 +1,57 @@
+#!/usr/bin/env ruby -w
+
+require 'csv'
+
+HEADERS = %w[device_name sessions].freeze
+
+DEVICES_PATH = File.join(__dir__, 'supported_devices.csv')
+
+# Maps device model to name using Google's giant CSV that lives alongside this file.
+DEVICE_MAP = CSV.foreach(DEVICES_PATH).each_with_object({}) do |row, map|
+  # skip the first header row
+  next if row[0] == 'Retail Branding'
+
+  # columns: Retail Branding (maker), Marketing Name, Device (unused), Model
+  maker = row[0]
+  name = row[1]
+  model = row[3]
+  map[model] = "#{maker} #{name}"
+end
+
+def main
+  in_csv = CSV.new(ARGF)
+  sessions_by_device = count_devices(in_csv)
+  render_csv(sessions_by_device)
+end
+
+def zero_hash
+  Hash.new { |_k, _v| 0 }
+end
+
+def count_devices(in_csv)
+  # skip the first header row
+  in_csv.drop(1).each_with_object(zero_hash) do |row, h|
+    # devices come in a raw model and we have to look up the marketing name for each one
+    # e.g. SM-S908N and SM-S908U are 2 of 9 models of the Galaxy S22 Ultra line
+    device_model = row[0]
+    device_name = DEVICE_MAP[device_model] || device_model
+
+    # Skip things that are obviously not Android
+    next if device_name =~ /iphone|ipad/i
+
+    h[device_name] += 1
+  end
+end
+
+def render_csv(sessions_by_device)
+  puts CSV.generate_line(HEADERS)
+  sessions_by_device
+    .sort_by { |_device, sessions| sessions }
+    .reverse
+    .each do |device_name, sessions|
+      out_row = [device_name, sessions]
+      puts CSV.generate_line(out_row)
+    end
+end
+
+main if $PROGRAM_NAME == __FILE__